I thought this was tubes for fish breeding...in the description is says "tubes", thought it was maybe constructed of nice terra cotta, thought it had some sort of moss growing on it. Wrong, it's just a mound of hollow plastic with three round entrances and some astroturf crap glued to it.

Our Chinese Algae Eater loves this so much--it is the equivalent of his "pet bed"--and he has required it be moved with him from tank to tank as he has grown (the first couple moves we didn't initially transfer the pipes cave--as there were plenty of other caves in his new tank; but he was extremely stressed until we gave him back his pipes cave, then he returned to his usual chill self). He is also extremely territorial about this cave, though he tolerates our fish well when swimming around the tank, he won't let any fish get too close to his pipes cave, even the snails nosed away. As he is about 7" long now, we have just purchased him a second pipes cave to tie to the first (his tail was hanging out the back)--he loves the second pipes cave as much as the first and is thrilled to have his cave "expanded".

They do a great job in the picture hiding the fact the inside is all hollow, meaning its not 3 tubes, just 3 entrances into one cave and as others have said sharp. I wanted 3 tubes, i only bought cuz it was clearance as was preparing for a future pleco bunk bed, now its just garbage. Also, No clue what the fake green astroturf fiber crap is on top, prolly not good to be in your tank lol

I bought this for my 10gallon Betta tank and he loves this! He’s always swimming through it and it’s adorable to see :) Also makes my tank look really nice! At first I thought each hole was a separate tube but it’s actually one big space inside. Plenty of space for my fish to swim through.

My catfish loves sitting on top of it while my Patty’s live exploring

I purchased this for my Betta, though I'm not sure if he'll use it - I like it for just decor anyways regardless. I ran my fingers along the edges and was able to cut my finger, you absolutely should use a nail file or sandpaper to file it down. On the outer parts of the rings, the rings themselves, AND the inside will all be sharp. I spent about 20 minutes making sure it was safe enough to put in. Regardless of what type of fish you'll give this to, it wouldn't hurt to take precaution to just give it a quick file down

Nice hideaway for the nano fish, but the tubes had extremely sharp edges and I had to put a ring of silicone around each ring, 6x, to soften the edges so the fish fins would not get ripped.

IT LOOK GOOD BUT VERY SMALL BUT I GUESS ITS GOOD FOR THE PRICE